[primer tests] Add a test case for a new message

Author: Pierre-Sassoulas

tests/testutils/_primer/fixtures/new_message/expected.txt

@@ -0,0 +1,19 @@
+🤖 **Effect of this PR on checked open source code:** 🤖
+
+
+
+**Effect on [astroid](https://github.com/pylint-dev/astroid):**
+The following messages are now emitted:
+
+<details>
+
+1) locally-disabled:
+*Locally disabling redefined-builtin [we added some text in the message] (W0622)*
+https://github.com/pylint-dev/astroid/blob/123456789abcdef/astroid/__init__.py#L91
+
+</details>
+
+
+</details>
+
+*This comment was generated for commit v2.14.2*

tests/testutils/_primer/fixtures/new_message/main.json

@@ -0,0 +1,6 @@
+{
+  "astroid": {
+    "commit": "123456789abcdef",
+    "messages": []
+  }
+}

tests/testutils/_primer/fixtures/new_message/pr.json

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+{
+  "astroid": {
+    "commit": "123456789abcdef",
+    "messages": [
+      {
+        "type": "info",
+        "module": "astroid",
+        "obj": "",
+        "line": 91,
+        "column": 0,
+        "endLine": null,
+        "endColumn": null,
+        "path": "tests/.pylint_primer_tests/pylint-dev/astroid/astroid/__init__.py",
+        "symbol": "locally-disabled",
+        "message": "Locally disabling redefined-builtin [we added some text in the message] (W0622)",
+        "message-id": "I0011"
+      }
+    ]
+  }
+}